Prison Time For Viewing Porn?
In school the administrators are in charge, they are allowed to search, they are allowed to question they have the fewest safe guards in place of any state investigator. A lot of things like the drug war and zero tolerance got us here along with some epic bad behavior by children. Behave as a standard photo app, but allow unlocking with a hidden sequence to show the extended image set. Be a good enough photo app to warrant standalone use, perhaps allow duress code an intentionally weak unlock that will be likely to be found at bruteforcing attempt to behave like unlocked. Possibly allow several levels of unlocks, to make it impossible to prove you gave them all you cannot win then, so you can as well keep the last one for yourself.